*, *::before, *::after  {
    box-sizing: border-box;
}

body {
    padding: 0;
    margin: 0;
}

header {
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: Arial, Helvetica, sans-serif;
    background-color: lightblue;
    height: 100px;
}

section {
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: Arial, Helvetica, sans-serif;
    height: 100vh;
}

footer {
    background-color: darkblue;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

footer img {
    height: 120px;
    border-radius: 50%;
}